US6508174B1 - Electrostatic printing aid - Google Patents

Electrostatic printing aid Download PDF

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Publication number
US6508174B1
US6508174B1 US09/628,424 US62842400A US6508174B1 US 6508174 B1 US6508174 B1 US 6508174B1 US 62842400 A US62842400 A US 62842400A US 6508174 B1 US6508174 B1 US 6508174B1
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US
United States
Prior art keywords
voltage
electrostatic printing
high voltage
aid according
printing aid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime, expires
Application number
US09/628,424
Other languages
English (en)
Inventor
Ernst August Hahne
Franz Knopf
Thomas Ludwig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ELTEX-ELECTROSTATIC GmbH
Eltex Elektrostatik GmbH
Original Assignee
Eltex Elektrostatik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7916568&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US6508174(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Eltex Elektrostatik GmbH filed Critical Eltex Elektrostatik GmbH
Assigned to ELTEX-ELECTROSTATIC GMBH reassignment ELTEX-ELECTROSTATIC GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAHNE, ERNST AUGUST, KNOFP, FRANZ
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/001—Heliostatic printing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/37—Printing employing electrostatic force

Definitions

  • the invention relates to an electrostatic printing aid.
  • Electrostatic printing aids to assist with the transfer of printing ink are known in a multitude of designs. To avoid fires and explosions where such printing aids are used with printing inks containing flammable solvents, measures must be taken to prevent ignition of the mixture generated from the mixing of the solvents with air. In environments that are subject to explosion hazards, the electrostatic printing aid is subject to special safety precautions.
  • the voltage transfer with known electrostatic printing aids is carried out with normal voltage transfer devices, such as corona electrodes and rotational transformers.
  • normal voltage transfer devices such as corona electrodes and rotational transformers.
  • the safety standards for operating such voltage transfer devices in environments that are subject to explosion hazards require more expensive and complicated designs of these voltage transfer devices.
  • a known generic, so-called intrinsically safe electrostatic printing aid achieves the required safety by monitoring the resistive as conductivity of a connected impedance to the high-voltage generator. When the conductivity exceeds the setpoint limit, the output voltage of the high-voltage generator is switched off. This means that the resistance value of a consumer that is connected to the generator must not fall below a preset minimum resistance value in environments that are subject to explosion hazards.
  • the consumer of the electrostatic printing aids relates to a cylinder onto which an electrically conductive coating has been applied, the so-called impression cylinder.
  • the conductivity of the coating is thus decisive for the safe functioning of the known generator.
  • the electrical conductivity of such cylinder coatings can only be adjusted within wide tolerances during manufacture.
  • this conductivity is highly dependent on temperature and aging factors.
  • the objective of this invention is to develop an electrostatic printing aid to assist with the transfer of printing ink containing flammable solvents during printing which can be used in environments that are subject to explosion hazards and that has a simpler design and higher operating efficiency, without endangering safety, and one where safety and functionality do not depend on the widely spread ranges of electrical conductivity of the user that is connected to the printing aid.
  • this problem is solved by providing the high voltage generator with an adjustable limitation device for its power output and designing the voltage transfer device as slip rings, slip ring brushes, contact rollers, contact springs and/or electrically conductive roller or ball bearings.
  • a high-voltage generator with a maximum output performance is provided to keep the design of the voltage transfer device as simple as possible; for example as a slip ring brush, as a contact roller or spring, or as an electrically conductive ball bearing.
  • the voltage transfer device in contrast with prior art practice, complicated and high-cost encapsulated voltage transfer devices are not necessary. Instead, all prior-art direct voltage transfer devices can be used as they have been up to now for applications that are not subject to explosion hazards. Moreover, no restrictions with respect to the functionality relating to the electrical conductivity of a connected consumer need be considered
  • the coatings for the impression cylinder can be used over a significantly wider conductivity range, which comes much closer to the technical feasibility during the manufacture of such coatings, and which expands the implementation of an electrostatic printing aid.
  • a suitable design of the high-voltage generator that has a maximum electrical output efficiency comprises a voltage limitation for the maximum voltage and/or a current limitation for maximum current.
  • An especially suitable design has redundant voltage and current limitation, which assures safety even if one or two faults that are independent of each other occur in the voltage limitation device and/or current limitation device.
  • the high voltage generator may have a constant voltage and the limitation device then includes current limiters; alternatively, the high voltage generator may be a constant current source and the limitation device may then include voltage limiters.
  • the limitation device may include voltage limiters and current limiters.
  • a high-voltage generator 3 generates an electrostatic high voltage, which has been connected through its output terminals 31 and 32 to a voltage transfer device which has been developed as an electrical brush, collectively referred to as voltage transfer device 2 , which engages a shaft 11 of the impression cylinder referred to as 1 .
  • the impression cylinder has a casing that is coated with an electrically conductive coating 12 , which transfers the electrical charge to the web 5 that is to be printed and which is located between the impression cylinder and a grounded printing cylinder 4 .
  • the area that is subject to explosion hazards, due to the solvent/air mixture, is referred to as 100 .
  • the high-voltage generator 3 comprises a voltage device 33 for generating an adjustable high voltage, at the one terminal where three current limitation devices 34 are connected in series. After this series connection of the current limitation devices 34 , a parallel connection of the three voltage limitation devices 35 for the high voltage at the electrical output terminals 31 and 32 of the high-voltage device 3 has been provided, collectively referred to as 36 .
  • the output power of the high voltage 36 is limited to a maximum value. For example, the maximum electrical energy of the output power can be set to not exceed 350 mJ.
  • the voltage limiters 35 limit the voltage to up to 3000V.
  • the current limiters 34 limit the current to up to 12 mA.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
  • Measuring Fluid Pressure (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Rotary Presses (AREA)
  • Glass Compositions (AREA)
  • Dc-Dc Converters (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Photoreceptors In Electrophotography (AREA)
US09/628,424 1999-07-29 2000-07-28 Electrostatic printing aid Expired - Lifetime US6508174B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19935784A DE19935784A1 (de) 1999-07-29 1999-07-29 Elektrostatische Druckhilfe
DE19935784 1999-07-29

Publications (1)

Publication Number Publication Date
US6508174B1 true US6508174B1 (en) 2003-01-21

Family

ID=7916568

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/628,424 Expired - Lifetime US6508174B1 (en) 1999-07-29 2000-07-28 Electrostatic printing aid

Country Status (8)

Country Link
US (1) US6508174B1 (de)
EP (1) EP1072406B1 (de)
JP (1) JP2001038947A (de)
AT (1) ATE299437T1 (de)
DE (2) DE19935784A1 (de)
DK (1) DK1072406T3 (de)
ES (1) ES2244376T3 (de)
PT (1) PT1072406E (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100285228A1 (en) * 2008-01-25 2010-11-11 Illinois Tool Works Inc. Impression roller and use of the same
US20110224930A1 (en) * 2010-03-10 2011-09-15 Total Manufacturing Co. System and method for detection of insect infestation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202005016974U1 (de) * 2005-10-25 2006-01-05 Dettke, Christa Presseur

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3477369A (en) * 1967-05-04 1969-11-11 Hurletron Inc Electrostatically assisted intaglio printing
US3641971A (en) * 1967-09-01 1972-02-15 Arvid C Walberg Apparatus for preventing arcing in an electrostatic coating system
US3875892A (en) * 1974-01-14 1975-04-08 Ransburg Corp Apparatus for avoiding sparks in an electrostatic coating system
US4360850A (en) * 1979-10-30 1982-11-23 Hurletronaltair, Inc. Intrinsically safe electrostatic assist units
US4909147A (en) * 1983-02-07 1990-03-20 Gravure Association Of America Method for direct charging of the surface of an impression roll of an electrostatic assist gravure press
US4966555A (en) * 1989-04-24 1990-10-30 Rotation Dynamics Corporation Electrostatic assist rotogravure printing safety contact

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5243487A (en) * 1990-12-20 1993-09-07 Hurletron Incorporated Gravure press with crowbar circuit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3477369A (en) * 1967-05-04 1969-11-11 Hurletron Inc Electrostatically assisted intaglio printing
US3641971A (en) * 1967-09-01 1972-02-15 Arvid C Walberg Apparatus for preventing arcing in an electrostatic coating system
US3875892A (en) * 1974-01-14 1975-04-08 Ransburg Corp Apparatus for avoiding sparks in an electrostatic coating system
US4360850A (en) * 1979-10-30 1982-11-23 Hurletronaltair, Inc. Intrinsically safe electrostatic assist units
US4909147A (en) * 1983-02-07 1990-03-20 Gravure Association Of America Method for direct charging of the surface of an impression roll of an electrostatic assist gravure press
US4966555A (en) * 1989-04-24 1990-10-30 Rotation Dynamics Corporation Electrostatic assist rotogravure printing safety contact

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100285228A1 (en) * 2008-01-25 2010-11-11 Illinois Tool Works Inc. Impression roller and use of the same
US8444538B2 (en) * 2008-01-25 2013-05-21 Illinois Tool Works, Inc. Impression roller and use of the same
US20110224930A1 (en) * 2010-03-10 2011-09-15 Total Manufacturing Co. System and method for detection of insect infestation

Also Published As

Publication number Publication date
DE50010696D1 (de) 2005-08-18
ATE299437T1 (de) 2005-07-15
JP2001038947A (ja) 2001-02-13
PT1072406E (pt) 2005-09-30
EP1072406B1 (de) 2005-07-13
ES2244376T3 (es) 2005-12-16
EP1072406A1 (de) 2001-01-31
DE19935784A1 (de) 2001-02-01
DK1072406T3 (da) 2005-11-07

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